Dental tray



. F. E. ROACH.

DENTAL TRAY.

APPLICATION FILED MAY 20, 1920.

Patented Feb. 8, 1921.'

W WC PATENT OFFICE.

FINIS E. ROACH, OF CHICAGO, ILLINOIS.

DENTAL TRAY.

Specification of Letters Patent.

Patented Feb. 8 1921.

Application filed. May 20, 1920. Serial No. :382,939.

TO all 'whom it may conccm Be it known that I, FINIS E. ROACH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Dental Trays, oi" which the following is a specification, reference being` had to the accompanyng dl'awings and to the reference characters 10 marked thei-een, which form a part of this specification.

This invention relates to improvements in sectional trays and more particularly to a sectional tray used by dentists for holding imp'ession material.

It is frequently necessary to obtain a model or cast of a tooth or other formation in the mouth ot a patient and to do this, impression material is applied to the tooth or formation in the mouth in order to obtain a suitable mold 01 impression of the same, from which a model or cast of the tooth or 'formation may be made.

The inaccessibility of the tooth in the patient s mouth, the difiiculty of applying the mpression material in sufiicient quantity to surround the tooth or part without at the same time rubbing or spilling the material over othe parts of the mouth, and on account ott the soft oi' plastic nature ot' the material, the difficulty of handlng the same for the purpose mentioned, present practical obstacles which it is the principal object of my invention to overcome.

The nature of my improvement and the advantages thereof will 'be more 'fully comprehended by reference to the accompanying drawing, as I proceed with my specification.

In said drawings:

Figure 1 illustrates in a perspective View, a sectional tray made in accordance with my invention.

Fig. 2 is a plan view of the olank from which this tray is made.

Fig. 3 is a top plan View of the major arm of the tray showing the minor arm in plan View. v

Fig. 4 is an inside plan View of the major arm of the tray showing the minor arm in edge View.

Fig. 5 is a transverse, Vertical, sectional View, enlarged, taken upon the plane of the dotted line 6-5 of Fig. 3, looking in the direction indicated by the ar'ows.,

Fig. (3 is a transverse Vertical section-al View of part of the major arm of the t'ay, enlarged, the section being taken on the dotted line 6---6of Fig. 4:. i r

In said drawing, A represents the implement as a whole, stamped from the blank B, so as to form two parts--the major arm C and the smaller part or fiange D, joined together by the web (e. During the same operation in whi'h the blank B is stampcd out OI' in a second operation, as may be most desirable, there is foi med in'the major arm C a 'longitudinally extending, concavoconvex rib c which tends to greatly i strengthen the arm C. The rih c, as shown,

need not extend the 'entirelength of the arm. At the smaller end of the arm C is a stamped out and raised up bracket b for the purpose hereinafte' named.

In a substantially parallel relation thereto and extending lengthwise of the fiange D, are two similarly stamped out brackets d, d', the brackets d, (Z', being in substantial alinement with the hracket I). It will he noted by reference to Fig. 3, that 'the major arm C is substantially straight throughout its length; that is, in a single plane; and hy reference to Figs. 4 and '5, that the smaller portion or flange D, while substantially straight in` one dimension, is concavo-convex in the other dimension. That isto say, when the flange D is bent up from the blank along the web portion'` a, its inside surface is substantially at right angles to the proximate surface of the major arm C, while the same surface is con- VeX or curved along its major axis, as indicated more clearly in Fig. 4:. Thus it is that the space included in the angle of these two parts has projecting into it the brackets b, d, d'.

E represents any suitable enveloping or impression material placed in the angle between the parts C and D, and suitahly held therein by the brackets b, d, d'. The bracket b, it will be noticed, is preferably so formed, that is to say, is struck up so fully as to leave an opening b' therethrough. Similarly, the brackets (l, d', are formed with openings (Z d The brackets (Z, el', thus readily embed 'themselves in the impression material E, some part of said material entering the small openings in the brackets. The enyeloping material E is thus removably locked to the tray A.

In Fig. 5 I have illustrated a tooth to which the enveloping material E in the tray has been applied, to indicate, generally, the manner of use. It will be manifest that this tray may be made of a Very light materal, that it is so shaped and formed as to hold the necessary quantity of enveloping material for the purpose of taking an impression of a tooth or formation in the mouth, and that it may be very easily and readily applied in the mouth tor the purpese desired. i

After the impression is formed in the material E, said material may, manifestly, be quickly and easily removed from the tray and a new batch of enveloping material applied for another operation. The device lS simple, relatively cheap to manufacture, and has no complicated parts to get out of order.

Slight changes may be made in the shape and design of the'tray without departing from the spirit of my invention, but after considerable use of the article, I 1'8001 mend the form herein illustrated as highly desirable and as possessing great utility.

This implement will be found most convenient in making impressions at one time of a plurality of teeth with or without space between the teeth. Where the implement is applied" as inclicated in Fig. 5, that is, to the top and one side of the tooth and after the impression material E is sufcently hardened or set, I work the surface e to any arbitrary parting line position, and then apply a quantity of fresh impression material to the other side of the teeth and against the surface e. After this is set, I then part and remove the two portions and When ont of the mouth I place them in juxtapositon whereby I obtain a perfect mold for a cast in one unitary structure of all the teeth treated together With the space, if any, between them. This will be found to be a specially important advantage in the use of my dental tray. I prefer to make the trays rights and lefts to further increase their usefulness.

I claim as my invention:

l. A dental, sectional tray stamped from a single blank, comprising a. major and a minor member oined by a suitable web and bent at right angles to each other, and in tegral brackets formed on the` major and minor members.

2. A dental sectional tray stamped from a single blank, having a majorand a minor member joined by a suitable web and bent at right angles to each other, and brackets formed on the major and minor members, the minor member being longitudinally curved.

A sectional dental tray consstng of a handle member of thin metal provided with. a strengthening rib extending` longitudinally and having at one end an integral ange member bent at substantially right angles to the face of the handle member, said flange member being also bent or curved lon'gtudinally With its ends extending away from said handle member.

4. A sectional dental tray consisting of a handle member of thin metal provided with a strengthening rib extending longitudinally and having at one end an integral fiange member bent at substantially right angles to the face of the handle member, said flange member being also bent or curved longitudinally with its ends extending away from said handle member, a bracket projecting inwardly from the handle member and one or more brackets projecting inwardly from the flange member.

In testimony that I claim the foregoing as my invention I afiiX my signature, in the presence of two witnesses, this 14th day of May, 1920.

FINIS E. ROACH.

/Vitnesses:

TAYLOR E. BROWN, B.. L. MACGREGOR. 

